Encyclopedia of Earth
Encyclopedia of Earth: Physics & Chemistry: P H
Explains what pH is and its use in defining what acids and bases are. Also talks about the importance of pH for regulating metabolism in life forms. Includes a chart showing the pH values of common liquids. (Published: July 30, 2010)
Encyclopedia of Earth
Encyclopedia of Earth: Physics & Chemistry: Petrochemicals
Explains what petrochemicals are, the main hydrocarbon feedstocks that form the basis of petrochemical industries, sources, uses, and products made from petrochemicals. (Published: September 25, 2011)
Encyclopedia of Earth
Encyclopedia of Earth: Oxygen
Information about the element, Oxygen, atomic number 8. Covers history, physical and atomic properties, abundance, and permissible exposure limits. Also discusses forms of oxygen, isotopes, sources, and uses.
Encyclopedia of Earth
Encyclopedia of Earth: Conservation Biology: Overfishing
Article describing the scope of the problem of overfishing in the ocean and in fresh water bodies around the world. Adverse effects of this practice on both natural and human systems, and efforts to contain it are detailed. (Published:...
Encyclopedia of Earth
Encyclopedia of Earth: Evolutionary Biology: Organism
Article explaining what organisms are, their cellular foundation, and how they get their energy and nutrition. (Published: May 26, 2010)
Encyclopedia of Earth
Encyclopedia of Earth: Conservation Biology: Orangutan
Information about the orangutan: its scientific classification, physical features, reproduction, behavior, diet, habitat, threats to its survival, and efforts being taken to protect it. (Published: August 7, 2010)
Encyclopedia of Earth
Encyclopedia of Earth: On the Origin of Species (Historical E Book)
The complete original text of On the Origin of Species by Charles Darwin.
Encyclopedia of Earth
Encyclopedia of Earth: Ocean Oil: Deepwater Horizon Disaster
A collection of articles on the Deepwater Horizon oil spill that happened on April 20, 2010. It was caused by an offshore explosion on an oil platform fifty miles southeast of the Mississippi River delta.
Encyclopedia of Earth
Encyclopedia of Earth: Ocean Oil: Offshore Petroleum
A collection of articles on offshore oil. Some of the topics covered include the Deepwater Horizon oil spill, oil exploration and oil reserves, oil drilling, and the history of oil and gas.
Encyclopedia of Earth
Encyclopedia of Earth: Oak
Detailed information about oak trees: their taxonomy, evolution, habitats, morphology, significant oak forests around the world, and a list of species that are endangered. (Published: December 22, 2010)
Encyclopedia of Earth
Encyclopedia of Earth: Noise Pollution
Explains what noise pollution is, sources, the effects of noise propagation, the impact on health and on human and animal behaviors, strategies for reducing the effects of noise, and standards in place for regulating noise pollution....
Encyclopedia of Earth
Encyclopedia of Earth: Biochemistry: Nitrogen Cycle
Article explaining what the nitrogen cycle is, and its role in an ecosystem. (Published: June 28, 2010)
Encyclopedia of Earth
Encyclopedia of Earth: Nitrogen
Information about the element, Nitrogen, atomic number 14. Covers common chemical transformations, its physical properties, atomic properties, how abundant it is on the Earth, and details about health-related regulations. Also discusses...
Encyclopedia of Earth
Encyclopedia of Earth: Physics & Chemistry: Nitrate
Discusses the chemistry of nitrate, the negative agricultural effects of too much nitrate in soil and in water sources, its toxicity to plants and livestock, and the impact on human health.
Encyclopedia of Earth
Encyclopedia of Earth: Environmental Chemistry: Health Effects of Nickel
Explains what nickel is, ways it is used, how it is produced, how it gets into the environment and into our bodies, and the health effects of exposure to nickel. Also discusses how to reduce the risk of exposure. Has links to additional...
Encyclopedia of Earth
Encyclopedia of Earth: Natural Selection
Scientific article explaining what natural selection is, and how it manifests itself through genetics and from generation to generation. Natural selection is compared to genetic drift, both of which cause evolution to occur. The limits...
Encyclopedia of Earth
Encyclopedia of Earth: Natural Resource Management & Policy
An extensive collection of articles which discuss the policy and management of Earth's natural resources.
Encyclopedia of Earth
Encyclopedia of Earth: Natural Gas
Explains what natural gas is, how it is formed, its composition, measurement terminology, how companies locate and extract it, processing, how it is transported and stored, uses, and safety considerations. (Published: September 20, 2011)
Encyclopedia of Earth
Encyclopedia of Earth: Chemical Engineering: Natural Gas Processing
Explains the composition of natural gas and what is required to make it market-ready, types of reservoirs, and what happens in a natural gas processing plant. Includes a diagram showing the whole process. (Published: September 12, 2011)
Encyclopedia of Earth
Encyclopedia of Earth: Evolutionary Biology: Symbiosis
Article describes the different types of symbiosis, some of which are of mutual benefit, and others not. It also explains the differences between endosymbiosis and exosymbiosis, where one organism lives either inside or else upon the...
Encyclopedia of Earth
Encyclopedia of Earth: Microbiology: Mutation
Explains what genetic mutation is, results of mutation, types, how scientists use it in research and in medicine, what it looks like at the molecular level, chemicals that can cause mutation, and frequency of occurrence. (Published:...
Encyclopedia of Earth
Encyclopedia of Earth: Molybdenum
Information about the metallic element, Molybdenum, atomic number 42. It is unique in having an extremely high melting point. Covers its discovery, its biological importance, its physical and atomic properties, how abundant it is on the...
Encyclopedia of Earth
Encyclopedia of Earth: Conservation Biology: Mojave Desert
Information about the Mojave Desert: ways it differs from other deserts, its conservation status, and efforts to protect it. (Published: April 30, 2010)
Encyclopedia of Earth
Encyclopedia of Earth: Physics & Chemistry: Methane
Article explaining what methane is, its impact as a greenhouse gas on global warming, and natural and man-made sources of methane. (Published: April 30, 2010)